Lifting-jack



(No Mdel.)` 2 Shets-Shet 1.

H. C. KEELER.

'LIFTING JACK.

110.262,05@ 'Patented Aug.1,1882;

N. PETERS. Pnnwumompw. wma nnnnn a g y UNITED STATES PATENT OFFICE.

IIENEY c. KEELEE, or coUNoIn BLUEEs, IowA. h

LIFTING-JACK.

SPECIFICATION forming part of Letters Patent No. 262,050, dated August1, 1882.

Application tiled December Q8, 1881. (No model.)

To all whom it may concern:

Be it known that I, HENRY G. KEELER, of Council Buffs,in the countyofPottawattamie and State of Iowa, have invented a new and' tween thestandards, showing a modication of the pawls. Fig. 4 is a similarsection showing the jack arranged for grappling and raising weights thatlie upon or near the ground, or belowthe base of the standard or frameof `the jack; and Fig. 5 shows a modification ot' the main lever- Fig. 6is a sectional elevation, showing` the jack arranged to be placed immediately under the object to be raised; and Fig. 7 is a section of thesame, taken on the line y y of Fig. 6.

The frame or standard of my improved lifting-jack is composed of theparallel uprights A A, which are secured upon the base-board orsupport'B. These uprights A A are braced upon the -outside by the bracesb b, and they are each provided upon their inner faces with the slottedplates D D, having notched projectious e, with which the pendent pawls dd of the main lever E engage for raising and lowering the weight.

The pawls d d are each formed with the lips or projections it', and arepivoted at a c in the casting F, whichis secured by screws or othermeans `to the under side of the main lever. This casting is providedwith the side studs or trunnions, f f, which are adapted to move in theslots in the stepped plates. f

Through the center of the casting F, and up through the main lever,passes the sliding bolt g, the upper end of which is pivoted in theleverH, which rests upon the top of the main lever. To the lower end of thissliding bolt is attached the dat spring h, the ends of which are adaptedto impinge against the projections t' t' ofthe pawls, and in thechambers or socket so formed in the casting F and in the lower sideofthe main lever is placed upon the sliding belt the coiled springj,which tends at all times to force the bolt downward.

The llever H is so constructed and pivoted to the sliding bolt g thatwhen tipped forward npon the main lever to the position shown 1n Fig. 1the bolt and flat spring h will be raised, so that the spring will exerta tension upon the projections or lips i 'i of the pawls d and cause thelower ends ofthe pawls to beheld against the stepped plates, in whichposltlon, upon rocking the main leverin the frame, they will alternatelyengage with thesuccesslve steps of the plates D D upon opposite sides ofthe slots, and thus automatically cause the lever to move upward in theframe. Upon reversing the position of the lever H the sliding b olt andspring will be lowered, so that the spring will exert no force upon thepawls d, leaving them to swing away out of contact with the the plates DD, as shown in Fig. 2, in which position the main lever is free to dropto its lowest position in the frame. Upon standmg the lever H upon itsend, instead of tipplnglt over upon either side, as just described, thespring h will be held in such position that the pawls will be placed inclose proximity to the steps ot' the plates, but not in actual contactwith them, as when the lever is tipped forward. In this position, uponrocking the main lever the pawls will alternately engage with the stepsot' the plates and cause the main lever to be gradually lowered in theframe.

For litting the jack for raising very heavy weights, the lower ends ofthe pawls are provided with the hinge clutch-plates J J, which areadapted to engage with several of the steps or projections of the platesD D, thus furnishing a broad fulcrum or support for the lower ends ofthe pawls and diminishing the danger of bending or breaking the parts orarms of the plates by the weight and force upon the main lever.

For grappling and raisingweights which lie upon or near the ground-suchas railroad ties or rails-the frame ot' thejack will be made of thearched side pieces, A A', thelegs ot' which are adapted to rest `uponthe ground astride IOO the object to be raised, and the casting F willbe provided with the chain l, to the lower end of which are attached thegrappling-hooks or similar 1neans,N, for grappling and holding the loadto be raised.

In someinstances and for some uses theend of the main lever will beprovided with the pointed metal plate P, (shown in Fig. 5,) foradaptingthe jack to raise weights which cannot be raised by ablunt lever such asshown in Fig. 1, thus ttingthe jack for a wider range of work.

When constructed as shown in Figs. 6 and 7, the'standard will be roundin cross-section and hollow and slotted for the passage up and down ofthe lever, and the side pieces or parts of the standard will be tiedtogether at their upper ends with the cross-piece P', which guides andsupports the headed follower Q.' This follower is divided and the lowerend of the parts q q thereof are concaved, and reach over the lever Hand rest upon the studs or trunnionsff of the main lever, so that thefollower will permit the free action of the lever, and will be raisedand lowered with it for raising and lowering any load upon the followerunder which the jack may be placed.

Having thus described myinvention, I claim as new and desire to secureby Letters Patent- 1. In a lifting-jack, the combination, with thenprights A, provided with the slotted plates D, having notchedprojections e, of the lever E, provided with the studs, and theadjustablespring-actuated pawls a, substantially as and for the purposeset forth.

2. The pawls d d, formed with the lips or projections t' t', incombination with the adjustable spring h, substantially as and for thepurposes set forth.

3. In combination with the pivoted pawls (l d, provided with the lips ii, the sliding boltg, spring h, and the eccentric lever H, substantiallyas and for the purposes set forth.

4. The lever H, eccentrically pivoted to the upper end of the bolt g, incombination with the spring h, pivoted pawls d d, main lever E, and thestepped plates D I), substantially as and for the purposes described.

H..o. KEELER.

p Witnesses:

E. H. ODELL, DAVID J ERENAN.

